Sprinkler Pump lost/losing prime? (Florida)

Hi, I have a Utilitech sprinkler pump 1 1/2 HP. Moved into this Florida home last year, had this sprinkler system already installed. Problem is, at first everything went fine I guess. Go water flowing fast enough etc. Now I keep having to reprime to water my lawn every time I need it on. It loses pressure on the gauge the nest day and the water isn't being sucked through after even 5 minutes. I haven't check to the suction lines yet underground but there aren't any leaks in the suction line above ground leading to the pump. I have pictures of the system. Thanks!

I pulled up about 45 feet of piping from the well and I cut off the check valve at the beginning of the pipe. ( I wanted to see if there was anything wrong below the well) Turns out the check valve is indeed leaking when I pour water into it so I'll replace that and see if it works. Thank you.

I know, but I wanted to check the footvalve to see if that was ok or not. The check valve wouldn't have come off unless I pulled up a part of the piping anyway. I'll be able to couple em back together with couplings right?